Adsorption of heavy metals by Lycium barbarum branch-based adsorbents: raw, fungal modification, and biochar

The present study reports on the adsorptive removal of heavy metals (Cr3+, Cd2+, and Cu2+) from water by a series of Lycium barbarum branch-based adsorbents: Lycium barbarum branch (denoted as LB), fungal fermented LB (FLB), LB biochar (LBB), FLB biochar (FLBB), alkaline modified LBB (ALBB), and alk...

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Bibliographic Details
Published in:Water science and technology 2022-04, Vol.85 (7), p.2145-2160
Main Authors: Guan, Jian, Hu, Changwei, Zhou, Jun, Huang, Qingguo, Liu, Jiayang
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Adsorptivity
biochar
Cadmium
Charcoal
Copper
Equilibrium
Fermentation
Fungi
heavy metal
Heavy metals
Kinetic equations
Lycium barbarum
lycium barbarum branch
Metals
Pore size
Trivalent chromium
Wastewater treatment
Zeta potential
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Summary:The present study reports on the adsorptive removal of heavy metals (Cr3+, Cd2+, and Cu2+) from water by a series of Lycium barbarum branch-based adsorbents: Lycium barbarum branch (denoted as LB), fungal fermented LB (FLB), LB biochar (LBB), FLB biochar (FLBB), alkaline modified LBB (ALBB), and alkaline modified FLBB (AFLBB). The six adsorbents were characterized in terms of FTIR, SEM, surface area and pore size as well as zeta potential. The adsorptive potential of these adsorbents was tested under varying conditions – pH, contact time, initial concentration, and temperature. Adsorption results were well fitted with Langmuir, Freundlich, and Temkin models. The maximum adsorption capacity (qm) was calculated to be 6.29 mg/g for Cr3+ by FLB, 11.53 mg/g for Cd2+ by LB, and 7.27 mg/g for Cu2+ by LB. The pseudo-second-order kinetic equation better described the adsorption process. Based on the thermodynamics parameters, the adsorption of heavy metals was endothermic but not spontaneous for biochars. The experimental results offer a new way for recycling and reutilizing LB in wastewater treatment.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2022.067